Datasheet

SN65ALS176, SN75ALS176, SN75ALS176A, SN75ALS176B
DIFFERENTIAL BUS TRANSCEIVERS
SLLS040H – AUGUST 1987 – REVISED JUNE 2000
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
switching characteristics over recommended ranges of supply voltage and operating free-air
temperature range (unless otherwise noted)
SN65ALS176
PARAMETER TEST CONDITIONS MIN TYP
†
MAX UNIT
t
d(OD)
Differential output delay time R
L
= 54 Ω, C
L
= 50 pF, See Figure 3 15 ns
t
sk(p)
Pulse skew
‡
R
L
= 54 Ω, C
L
= 50 pF, See Figure 3 0 2 ns
t
sk(lim)
Pulse skew
§
R
L
= 54 Ω, C
L
= 50 pF, See Figure 3 15 ns
t
t(OD)
Differential output transition time R
L
= 54 Ω, C
L
= 50 pF, See Figure 3 8 ns
t
PZH
Output enable time to high level R
L
= 110 Ω, C
L
= 50 pF, See Figure 4 80 ns
t
PZL
Output enable time to low level R
L
= 110 Ω, C
L
= 50 pF, See Figure 5 30 ns
t
PHZ
Output disable time from high level R
L
= 110 Ω, C
L
= 50 pF, See Figure 4 50 ns
t
PLZ
Output disable time from low level R
L
= 110 Ω, C
L
= 50 pF, See Figure 5 30 ns
†
All typical values are at V
CC
= 5 V, T
A
= 25°C.
‡
Pulse skew is defined as the |t
PLH
– t
PHL
| of each channel of the same device.
§
Skew limit is the maximum difference in propagation delay times between any two channels of any two devices.
SN75ALS176, SN75ALS176A, SN75ALS176B
PARAMETER TEST CONDITIONS MIN TYP
†
MAX UNIT
Diff ti l t t
’ALS176 3 8 13
t
d(OD)
Differential output
delay time
’ALS176A
R
L
= 54 Ω, C
L
= 50 pF, See Figure 3
4
7 11.5
ns
()
delay
time
’ALS176B 5 8 10
t
sk(p)
Pulse skew
‡
R
L
= 54 Ω, C
L
= 50 pF, See Figure 3 0 2 ns
§
’ALS176 10
t
sk(lim)
Pulse skew
§
’ALS176A
R
L
= 54 Ω, C
L
= 50 pF, See Figure 3
7.5
ns
()
’ALS176B 5
t
t(OD)
Differential output transition time R
L
= 54 Ω, C
L
= 50 pF, See Figure 3 8 ns
t
PZH
Output enable time to high level R
L
= 110 Ω, C
L
= 50 pF, See Figure 4 23 50 ns
t
PZL
Output enable time to low level R
L
= 110 Ω, C
L
= 50 pF, See Figure 5 14 20 ns
t
PHZ
Output disable time from high level R
L
= 110 Ω, C
L
= 50 pF, See Figure 4 20 35 ns
t
PLZ
Output disable time from low level R
L
= 110 Ω, C
L
= 50 pF, See Figure 5 8 17 ns
†
All typical values are at V
CC
= 5 V, T
A
= 25°C.
‡
Pulse skew is defined as the |t
PLH
– t
PHL
| of each channel of the same device.
§
Skew limit is the maximum difference in propagation delay times between any two channels of any two devices.
SYMBOL EQUIVALENTS
DATA-SHEET
PARAMETER
TIA/EIA-422-B TIA/EIA-485-A
V
O
V
oa
, V
ob
V
oa
, V
ob
|V
OD1
| V
o
V
o
|V
OD2
| V
t
(R
L
= 100 Ω) V
t
(R
L
= 54 Ω)
|V
OD3
| None
V
t
(test termination
measurement 2)
∆|V
OD
| ||V
t
| – |V
t
|| ||V
t
| – |V
t
||
V
OC
|V
os
| |V
os
|
∆|V
OC
| |V
os
– V
os
|
|V
os
– V
os
|
I
OS
|I
sa
|, |I
sb
| None
I
O
|I
xa
|, |I
xb
| I
ia
, I
ib